package com.atguigu.study.base.safe;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @Author 快点干早点散
 * @Create 2025/4/23 19:25
 * Description:
 */
public class NotSafeDemo {
    public static void main(String[] args) {
//        listNotsafe();
//        SetNotsafe();
        MapNotsafe();
    }

    public static void MapNotsafe() {
        Map<String,String>map=new ConcurrentHashMap();//Collections.synchronizedMap(new HashMap<>()); //new HashMap<>();
        for (int i = 1; i <=100; i++) {
            new Thread(() -> {
                map.put(Thread.currentThread().getName(), UUID.randomUUID().toString().substring(0,6));
                System.out.println(map);
            },String.valueOf(i)).start();
        }
    }

    public static void SetNotsafe() {
        Set<String> set = new CopyOnWriteArraySet<>();//Collections.synchronizedSet(new HashSet<>()); //new HashSet<>();
        for (int i = 0; i < 100; i++) {
            new Thread(() -> {
                set.add(UUID.randomUUID().toString().substring(0, 6));
                System.out.println(set);

            }, String.valueOf(i)).start();
        }

    }

    public static void listNotsafe() {
        List<String> list = new CopyOnWriteArrayList<>(); //Collections.synchronizedList(new ArrayList<>());//new Vector<>(); //new ArrayList();

        for (int i = 1; i <= 100; i++) {
            new Thread(() -> {
                list.add(UUID.randomUUID().toString().substring(0, 6));
                System.out.println(list);

            }, String.valueOf(i)).start();
        }
    }
}
